Microwave oven



FIG. 1 is an enlarged perspective view of the microwave oven showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a front elevational view thereof with the door open;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a right side elevational view thereof; and

FIG. 7 is a left side elevational view thereof.

The cabinet shown in broken lines in FIGS. 1-7 is shown for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a microwave oven, as shown and described. 